The puncture was caused by a micrometeorite, the relatively fast depressurisation of the space suit might not be of the greatest concern for the unfortunate astronaut, as the micrometeorite could pass through the astronaut's body at speeds possibly an order of magnitude greater than a bullet exiting a shotgun can travel, causing anything from punctured through projectile wound, to instantly internally liquefying the poor astronaut's body in an unrecognisable mix of all of his/her internals, if the micrometeorite hits the space suit at extreme velocity relative to the movement of the EVA engaging astronaut and is big enough.